PEUGEOT Sport & TOTAL: Peugeot Hybrid4 500KW
PEUGEOT Sport has leveraged its experience of endurance racing (V12 and V8 PEUGEOT 908s) and that of PSA Motorsport in the FIA World Rally Championship (four cylinders) to develop a new 2 .6-litre, twin-turbo, 90-degree V6. Positioned behind the driver, this 500kW / 680hp powertrain will tip the scales at 165 kg and drive the rear wheels.
The architecture of the PEUGEOT HYBRID4 500KW (680hp) powertrain is the result of a highly- detailed brief shaped by the new FIA WEC regulations,” notes François Coudrain, PEUGEOT Sport’s WEC Programme Powertrain Director. “We initially considered a single turbo, but that would have prevented us from achieving our engine’s centre of gravity target. A twin-turbo V6 block offers the best trade-off between technology, weight, packaging of the engine’s ancillaries, reliability and performance.
The robotised sequential seven-speed (plus reverse) gearbox will be controlled by steering- wheel-mounted paddle shifters, and the PEUGEOT Sport-developed brake-by-wire system will also be managed electronically. The driver will be able to adjust the level of engine-braking gener ated by the electric motor under deceleration and the force applied by the pads to the braking discs to achieve the optimum electric regenerative/ hydraulic braking split. Optimal energy management, both under acceleration and during energy recovery (capped by the regulations at 200 kW/ 272hp), will consequently be key to the car’s performance and efficiency.
The cooling fluids and engine / gearbox lubricants will play an important role in the competitiveness of PEUGEOT Sport’s Hypercar which will use prototypes tailored by Total for intensive use and long life across a wide range of temperatures. Total has also developed special greases and oils that are evolutions of formula derived from its experience in motorsport. Total engineers will attend races as an integr al part of the team to take and analyse samples with a view to monitoring the life of the car’s assemblies over time.
The PEUGEOT Sport-conceived front-mounted 200kW (272hp) motor generator unit will drive the front wheels and benefits from the team’s experience of developing electric motors and management systems for production cars. This knowhow has been compounded by:
- PSA Motorsport’s expertise in the design and running of electrified systems in motorsport
- The recent launch of the PEUGEOT SPORT ENGINEERED line, plus the expertise of PEUGEOT and Groupe PSA in the fields of hybrid and fully-electric mobility
Although the internal combustio n engine delivers 500 kW (680hp) and the motor generator unit has a capacity of 200 kW (272hp), the regulatio ns set a maximum power output of just 500 kW (680hp) during races. To adapt to the different sit uations in competition, the LMH powertrain functions as follows:
- the regulations forbid the use of electrical energy below 120kph (75mph), so the motor gener ator unit only engages once this speed has been The car must pull away from standstill under the power of its internal combustion engine alone
- at full power, the power output of the bi-turbo V6 is capped at 300 kW (408hp) and adjusted as a function of the power delivered by the motor generator unit at 200 kW (272hp) which is directly dependent on the battery level
- when the motor gener ator unit comes into use, the car automatically switches to four-wheel drive, thereby modifying its drivability – through high-speed corners, for example
- when the high-density battery is empty, the internal combustio n engine reverts to 500 kW (680hp) power output and the transmission retur ns to rear-wheel drive. During races, the battery will be fully charged prior to the start by means of a mains-connected plug-in hybrid charger. Once out on the track, the battery will function completely independently and be charged only by the kinetic braking energy recovery
The following exceptions are covered by the regulations, however:
- the power output of the internal combustio n engine may be increased by three percent to 515 kW (700hp) at the end of straights when the battery is empty, so the electric motor is working as a 15 kW (20hp) This configuration is applied automatically by the car’s electronics
- the possibility to run with either the internal combustio n engine or the electric motor, or both concurrently, in the pitlane or when speed is restricted to 60kph(37 mph)
As required by the regulations, the Hypercar will be equipped with specific sensors to monitor and transmit the power levels measured at all four wheels to the FIA in real time to guarantee the maximum output specified by the Balance of Performance (BoP).
Before the track-testing programme begins at the end of 2021, PEUGEOT Sport and Total will continue their engineering which is expected to see the powertrain run on the bench and simulator in the course of the first half of 2021.